The developer of this plugin is inactive. The xpath settings for amazon has been changed and the plugin has not been updated with these changes. I've done some changes to the plugin recently and I plan on cleaning up the predefined list. In the mean time try putting these values in the webpage tab:
Rows: //li[@class="zg-item-immersion"]
Title: .//div[@class="p13n-sc-truncate p13n-sc-line-clamp-1"]/text()
Authors: .//a[@class="a-size-small a-link-child"]//text()[normalize-space()]
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